Scientific Calculator
A full scientific calculator that works with a keypad or your keyboard. Type whole expressions such as 2sin(30)+√16 and see a live preview before you press equals. It follows standard operator precedence, keeps your last answer as Ans, and remembers recent calculations in this browser.
How to use the Scientific Calculator
- Choose DEG or RAD for trigonometry.
- Tap the keys or type an expression directly, e.g. (3+4)^2 ÷ 7.
- Watch the live preview under the display, then press = or Enter.
- Use M+, M−, MR and MC to keep a running total, and Ans to reuse the last result.
- Click any entry in History to insert its result again.
Features
- sin, cos, tan and their inverses in degrees or radians
- ln, log, log₂, square and cube roots, absolute value, factorial up to 170!
- Correct precedence, right-associative powers (2^3^2 = 512) and implicit multiplication (2π)
- Memory keys, Ans, π and e constants, scientific notation with EXP
- Full keyboard support and a saved history list
Benefits
- Check homework, engineering and lab calculations without installing an app
- Clear error messages explain problems like dividing by zero or ln of a negative number
- Runs entirely in your browser — nothing is sent anywhere
Frequently asked questions
Why does -2^2 give -4?
Powers are evaluated before the minus sign, which is the standard mathematical convention. Write (-2)^2 if you want 4.
How does the % key work?
On its own, 50% means 0.5. After + or − it means a percentage of the number before it, so 200 + 10% = 220; with × or ÷ it is just divided by 100, so 200 × 10% = 20.
Why is tan(90) an error in degree mode?
The tangent of 90° is undefined (the value grows without limit), so the calculator reports it instead of showing a huge, misleading number.
What is the largest factorial I can calculate?
170! is the largest factorial that fits in standard double-precision numbers; 171! would overflow. Factorials need whole numbers from 0 to 170.
How accurate are the results?
Calculations use 64-bit floating point and results are rounded to 12 significant digits for display, which removes rounding noise like 0.1 + 0.2 = 0.30000000000000004.
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